ANTERIOR REGION OF THE SKULL. 



107 



eminences and margins of the orbit ; below, by the prominence of the chin ; on 

 each side, by the malar bone and anterior margin of the ramus of the jaw. In 

 the median line are seen from above downwards, the nasal eminences, which 

 indicate the situation of the frontal sinuses ; diverging' outwards from the nasal 

 eminences are the superciliary ridges which support the eyebrows. Beneath the 

 nasal eminences are the arch of the nose, formed by the nasal bones, and the nasal 

 processes of the superior maxillary. The nasal arch is convex from side to side, 

 concave from above downwards, presenting in the median line the inter-nasal 

 suture, formed between the nasal bones, laterally the naso-maxillary suture, 

 formed between the nasal bone and the nasal process of the superior maxillary 

 bones, both these sutures terminating above in that part of the transverse suture 



Fig. 65. Anterior Region of the Skull. 



TCNDO OCULI 



Ant. Naaal Spine 

 Incisive fossa, 



which connects the nasal bones and nasal processes of the superior maxillary 

 with the frontal. Below the nose is seen the heart-shaped opening of the ante- 

 rior nares, the narrow end upwards, and broad below ; it presents laterally the 

 thin sharp margins which serve for the attachment of the lateral cartilages of 

 the nose, and in the middle line below, a prominent process, the anterior nasal 

 spine, bounded by two deep notches. Below this is the intermaxillary suture, 

 and on each side of it the incisive fossa. Beneath this fossa is the alveolar- pro- 

 cess of the upper and lower jaw, containing the incisor teeth, and, at the- lower 

 part of the median line, the symphysis of the chin, the mental eminence,, ami the 

 incisive fossa of the lower jaw. 



Proceeding from above downwards, on each side, is the supra-orbital! ridge. 



